SJSU METR 280 - Remote Sensing on land Surface Properties (72 pages)

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Remote Sensing on land Surface Properties



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Remote Sensing on land Surface Properties

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Pages:
72
School:
San Jose State University
Course:
Metr 280 - Recent Developments in Meteorology

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Remote Sensing on land Surface Properties Menglin Jin Modified from Paolo Antonelli CIMSS University of Wisconsin Madison M D King UMCP lecture and P Mentzel outline Reflectance and albedo Vegetation retrieval Surface temperature retrieval Theory of clouds and fire retrieval MODIS Land Cover Classification M A Friedl A H Strahler et al Boston University 0 Water 1 Evergreen Needleleaf Forest 2 Evergreen Broadleaf Forest 3 Deciduous Needleleaf Forest 4 Deciduous Broadleaf Forest 5 Mixed Forests 6 Closed Shrublands 7 Open Shrublands 8 Woody Savannas 9 Savannas 12 Croplands 13 Urban and Built Up 14 Cropland Natural Veg Mosaic 10 Grasslands 15 Snow and Ice 16 Barren or Sparsely Vegetated 11 Permanent Wetlands 17 Tundra Reflectance The physical quantity is the Reflectance i e the fraction of solar energy reflected by the observed target To properly compare different reflective channels we need to convert observed radiance into a target physical property In the visible and near infrared this is done through the ratio of the observed radiance divided by the incoming energy at the top of the atmosphere Soil Vegetation Snow Ocean MODIS multi channels Band 1 0 65 m clouds and snow reflecting Band 2 0 86 m contrast between vegetation and clouds diminished Band 26 1 38 m only high clouds and moisture detected Band 20 3 7 m thermal emission plus solar reflection Band 31 11 m clouds colder than rest of scene Band 35 13 9 m only upper atmospheric thermal emission detected MODIS BAND 1 RED Low reflectance in Vegetated areas Higher reflectance in Non vegetated land areas MODIS BAND 2 NIR Higher reflectance in Vegetated areas Lower reflectance in Non vegetated land areas RED NIR Dense Vegetation Barren Soil Vegetation NDVI The NDVI is calculated from these individual measurements as follows NDVI NIR RED NIR RED NDVI Normalized Difference Vegetation Index Subsequent work has shown that the NDVI is directly related to the photosynthetic capacity and hence energy absorption of plant



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